Angel

Angels are supernatural entities which are said to exist alongside humans and demons. In many alleged cases, however, the "angel" is simply a demon with an angelic shape, so the existence of angels within the Devil May Cry universe is not entirely certain.

Devil May Cry 3 Manga
In the Devil May Cry 3 manga, Vergil and Arkham discuss the nature of devils and angels while gazing upon one of the Seven Sins. When Vergil comments that he sees only a devil, Arkham reminds him that the two, meaning angels and demons, were once the same thing, and that this Demon has retained its angelic appearance.

Devil May Cry 4
The Order of the Sword created a ritual called the Ascension Ceremony, which gives its participants angelic form and abilities but actually turns them into demons in the process. This process created Alto Angelos, as well as transforming Agnus and Credo into Angelo Agnus and Angelo Credo. Bianco Angelos, another result of the Order's research into demonic power, also possess angel-like appearance, however those are just inanimate armors possessed by demonic or human soul. The Wing Talisman is also claimed to be made from crystallized angel wing.

DmC: Devil May Cry
Dante is a half-angel, half-demon hybrid, and can channel his angelic powers by changing his sword into a variety of weapons.

Also, in one of the artworks shown at the Gamescom, four angels are depicted sitting around Dante.

Background
In religious beliefs, angels are divine beings who are often described as the messengers of God.